There are a fewsites that suggest that doing facial exercises can somehow help tone or firm up the face. However, skin contains elastin, and it stretches out the more the face muscles move (thus: crow's feet, laugh lines). Your teeth, meanwhile, have little to do with your overall facial tone.

However, looking at Cristiano Ronaldo has a tendency to make one smile, and smiling, in turn, has shown to make people happy. So ... thanks Fitness Pao!